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    <title>Feature animation example</title>
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        <a class="navbar-brand" href="./"><img src="./resources/logo-70x70.png">&nbsp;OpenLayers 3 Examples</a>
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          <h4 id="title">Feature animation example</h4>
          <p id="shortdesc">Demonstrates how to animate features.</p>
          <div id="docs"><p>This example shows how to use <b>postcompose</b> and <b>vectorContext</b> to animate features. Here we choose to do a flash animation each time a feature is added to the layer.</p>
</div>
          <div id="tags">animation, vector, feature, flash</div>
          <div id="api-links">Related API documentation: <ul class="inline"><li><a href="../apidoc/ol.Feature.html" title="API documentation for ol.Feature">ol.Feature</a></li>,<li><a href="../apidoc/ol.Map.html" title="API documentation for ol.Map">ol.Map</a></li>,<li><a href="../apidoc/ol.Observable.html" title="API documentation for ol.Observable">ol.Observable</a></li>,<li><a href="../apidoc/ol.View.html" title="API documentation for ol.View">ol.View</a></li>,<li><a href="../apidoc/ol.control.html" title="API documentation for ol.control">ol.control</a></li>,<li><a href="../apidoc/ol.easing.html" title="API documentation for ol.easing">ol.easing</a></li>,<li><a href="../apidoc/ol.geom.Point.html" title="API documentation for ol.geom.Point">ol.geom.Point</a></li>,<li><a href="../apidoc/ol.layer.Tile.html" title="API documentation for ol.layer.Tile">ol.layer.Tile</a></li>,<li><a href="../apidoc/ol.layer.Vector.html" title="API documentation for ol.layer.Vector">ol.layer.Vector</a></li>,<li><a href="../apidoc/ol.proj.html" title="API documentation for ol.proj">ol.proj</a></li>,<li><a href="../apidoc/ol.source.OSM.html" title="API documentation for ol.source.OSM">ol.source.OSM</a></li>,<li><a href="../apidoc/ol.source.Vector.html" title="API documentation for ol.source.Vector">ol.source.Vector</a></li>,<li><a href="../apidoc/ol.style.Circle.html" title="API documentation for ol.style.Circle">ol.style.Circle</a></li>,<li><a href="../apidoc/ol.style.Stroke.html" title="API documentation for ol.style.Stroke">ol.style.Stroke</a></li></ul></div>
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        <form method="POST" id="jsfiddle-form" target="_blank" action="http://jsfiddle.net/api/post/jquery/1.11.0/">
          <textarea class="hidden" name="js">var map &#x3D; new ol.Map({
  layers: [
    new ol.layer.Tile({
      source: new ol.source.OSM({
        wrapX: false
      })
    })
  ],
  controls: ol.control.defaults({
    attributionOptions: /** @type {olx.control.AttributionOptions} */ ({
      collapsible: false
    })
  }),
  target: &#x27;map&#x27;,
  view: new ol.View({
    center: [0, 0],
    zoom: 1
  })
});

var source &#x3D; new ol.source.Vector({
  wrapX: false
});
var vector &#x3D; new ol.layer.Vector({
  source: source
});
map.addLayer(vector);

function addRandomFeature() {
  var x &#x3D; Math.random() * 360 - 180;
  var y &#x3D; Math.random() * 180 - 90;
  var geom &#x3D; new ol.geom.Point(ol.proj.transform([x, y],
      &#x27;EPSG:4326&#x27;, &#x27;EPSG:3857&#x27;));
  var feature &#x3D; new ol.Feature(geom);
  source.addFeature(feature);
}

var duration &#x3D; 3000;
function flash(feature) {
  var start &#x3D; new Date().getTime();
  var listenerKey;

  function animate(event) {
    var vectorContext &#x3D; event.vectorContext;
    var frameState &#x3D; event.frameState;
    var flashGeom &#x3D; feature.getGeometry().clone();
    var elapsed &#x3D; frameState.time - start;
    var elapsedRatio &#x3D; elapsed / duration;
    // radius will be 5 at start and 30 at end.
    var radius &#x3D; ol.easing.easeOut(elapsedRatio) * 25 + 5;
    var opacity &#x3D; ol.easing.easeOut(1 - elapsedRatio);

    var flashStyle &#x3D; new ol.style.Circle({
      radius: radius,
      snapToPixel: false,
      stroke: new ol.style.Stroke({
        color: &#x27;rgba(255, 0, 0, &#x27; + opacity + &#x27;)&#x27;,
        width: 1
      })
    });

    vectorContext.setImageStyle(flashStyle);
    vectorContext.drawPointGeometry(flashGeom, null);
    if (elapsed &gt; duration) {
      ol.Observable.unByKey(listenerKey);
      return;
    }
    // tell OL3 to continue postcompose animation
    frameState.animate &#x3D; true;
  }
  listenerKey &#x3D; map.on(&#x27;postcompose&#x27;, animate);
}

source.on(&#x27;addfeature&#x27;, function(e) {
  flash(e.feature);
});

window.setInterval(addRandomFeature, 1000);
</textarea>
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  &lt;div class&#x3D;&quot;span8&quot;&gt;
    &lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
  &lt;/div&gt;
&lt;/div&gt;
</textarea>
          <input type="hidden" name="wrap" value="l">
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        </form>
        <pre><code id="example-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
&lt;title&gt;Feature animation example&lt;/title&gt;
&lt;script src="https://code.jquery.com/jquery-1.11.2.min.js"&gt;&lt;/script&gt;
&lt;link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css"&gt;
&lt;script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"&gt;&lt;/script&gt;
&lt;link rel="stylesheet" href="http://openlayers.org/en/v3.11.1/css/ol.css" type="text/css"&gt;
&lt;script src="http://openlayers.org/en/v3.11.1/build/ol.js"&gt;&lt;/script&gt;

&lt;/head&gt;
&lt;body&gt;
&lt;div class="container-fluid"&gt;

&lt;div class&#x3D;&quot;row&quot;&gt;
  &lt;div class&#x3D;&quot;span8&quot;&gt;
    &lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
  &lt;/div&gt;
&lt;/div&gt;

&lt;/div&gt;
&lt;script&gt;
var map &#x3D; new ol.Map({
  layers: [
    new ol.layer.Tile({
      source: new ol.source.OSM({
        wrapX: false
      })
    })
  ],
  controls: ol.control.defaults({
    attributionOptions: /** @type {olx.control.AttributionOptions} */ ({
      collapsible: false
    })
  }),
  target: &#x27;map&#x27;,
  view: new ol.View({
    center: [0, 0],
    zoom: 1
  })
});

var source &#x3D; new ol.source.Vector({
  wrapX: false
});
var vector &#x3D; new ol.layer.Vector({
  source: source
});
map.addLayer(vector);

function addRandomFeature() {
  var x &#x3D; Math.random() * 360 - 180;
  var y &#x3D; Math.random() * 180 - 90;
  var geom &#x3D; new ol.geom.Point(ol.proj.transform([x, y],
      &#x27;EPSG:4326&#x27;, &#x27;EPSG:3857&#x27;));
  var feature &#x3D; new ol.Feature(geom);
  source.addFeature(feature);
}

var duration &#x3D; 3000;
function flash(feature) {
  var start &#x3D; new Date().getTime();
  var listenerKey;

  function animate(event) {
    var vectorContext &#x3D; event.vectorContext;
    var frameState &#x3D; event.frameState;
    var flashGeom &#x3D; feature.getGeometry().clone();
    var elapsed &#x3D; frameState.time - start;
    var elapsedRatio &#x3D; elapsed / duration;
    // radius will be 5 at start and 30 at end.
    var radius &#x3D; ol.easing.easeOut(elapsedRatio) * 25 + 5;
    var opacity &#x3D; ol.easing.easeOut(1 - elapsedRatio);

    var flashStyle &#x3D; new ol.style.Circle({
      radius: radius,
      snapToPixel: false,
      stroke: new ol.style.Stroke({
        color: &#x27;rgba(255, 0, 0, &#x27; + opacity + &#x27;)&#x27;,
        width: 1
      })
    });

    vectorContext.setImageStyle(flashStyle);
    vectorContext.drawPointGeometry(flashGeom, null);
    if (elapsed &gt; duration) {
      ol.Observable.unByKey(listenerKey);
      return;
    }
    // tell OL3 to continue postcompose animation
    frameState.animate &#x3D; true;
  }
  listenerKey &#x3D; map.on(&#x27;postcompose&#x27;, animate);
}

source.on(&#x27;addfeature&#x27;, function(e) {
  flash(e.feature);
});

window.setInterval(addRandomFeature, 1000);

&lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;</code></pre>
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    <script src="./resources/prism/prism.min.js"></script>
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